Packaging body, its manufacture, and its manufacturing device

[Technical Field to which the Invention belongs] The present invention relates to a packaging body for internally storing detergents, foodstuffs, etc., a method for producing the same, and a manufacturing apparatus thereof.

[0002] Conventionally, as a packaging body for storing a detergent or the like inside, a packaging body in which a pair of films are provided and the peripheral edges thereof are attached by heat sealing is known.

[0003] In such a package, a half-cut cut line is formed on the surface of each film, and the film is torn by the cut line to open the package. The contents are then ejected through this opened opening.

[0004] As described above, the package is manufactured by laminating a pair of films by heat sealing, and a cut line is formed in each film. However, if the positions of the cut lines formed in the films do not match accurately, the opening action is difficult and the shape of the opened opening becomes unstable.<u style="single">Further, when the width of the laser processing line provided on the package is constant, the package cannot be cut smoothly.</u>[0005] The present invention has been made in consideration of such points, and the positions of the cut lines formed in each of the pair of films are accurately matched.<u style="single">At the same time, the package can be torn smoothly.</u>An object of the present invention is to provide a package, a method for producing the package, and an apparatus for producing the package.

[0006] [Means for Solving the Problems] The present invention comprises a step of preparing the pair of films in a package manufacturing method for manufacturing a package by laminating at least a pair of films having a laser absorbing layer. The process of manufacturing a package by laminating a pair of films,<u style="single">A step of irradiating a laser with one laser irradiation device provided on one film side toward one film surface, heating and melting the laser absorption layer to form a laser processing line on one film surface, and the other. Laser irradiation is performed by the other laser irradiation device provided on the other film side toward the film surface, the laser absorption layer is heated and melted, and the laser processing line formed on the other film surface by the one laser irradiation device is formed. The process of forming the corresponding laser processing line and</u>In the step of forming a laser processing line, which comprises a step of cutting a pair of films into a package to prepare a package, the pair of films are intermittently conveyed with the width of the package as one pitch. During the transfer of the pair of films, the laser irradiation device continuously irradiates the laser, and the rate at which the pair of films is conveyed gradually increases from 0 for each pitch, and after taking the maximum value in the middle, A method for manufacturing a package, which is characterized by a gradual decrease, in a package manufacturing apparatus for manufacturing a package by laminating at least a pair of films having a laser absorbing layer, a film transport line for transporting the pair of films, and a film transport line. A heat-sealing device installed on a film transport line that attaches a pair of films together.<u style="single">A laser irradiation device is provided on one film side to form a laser processing line on one film surface by irradiating a laser toward one film surface and heating and melting the laser absorption layer, and the other film. Laser irradiation is performed toward the surface, the laser absorption layer is heated and melted, and a laser processing line corresponding to the laser processing line formed by one laser irradiation device is formed on the other film surface on the other film side. With the other laser irradiator</u>The film transport line is provided with a laser-processed line forming portion having a structure and a cutting portion for cutting a pair of films into a package to produce a package, and the film transport line intermittently cuts the pair of films into a package with a width of 1 pitch. The transfer speed is gradually increased from 0 for each pitch, the maximum value is reached in the middle, and then the transfer speed is gradually decreased. The laser irradiation device continuously increases the transfer speed of the pair of films during the transfer. It is provided with a packaging material manufacturing apparatus characterized by irradiating the film with laser light and a pair of films having at least a laser absorbing layer, and the peripheral edges of the pair of films are heat-sealed by heat-sealing. In a packaging body in which no region is formed, a laser-processed line formed by heating and melting a laser absorbing layer is formed on each surface of the pair of films, and both ends of the laser-processed line reach the periphery of the pair of films. Therefore, the width of the laser-processed line is large in the vicinity of the edge and small in the central portion, and the laser-processed line is characterized in that it passes through the heat-sealed portion and the non-heat-sealed region of the package. It is a packaging body.

[0007] According to the present invention, since the laser absorption layer of a pair of films is heated and melted in the package manufacturing apparatus to form a laser processing line to produce a package, laser processing of the front surface and the back surface of the package is performed. The position of the line does not shift, and the package can be easily torn along the laser-processed line.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 5 are diagrams showing an embodiment of a package, a manufacturing method thereof, and a manufacturing apparatus according to the present invention.

[0009] First, the package according to the present invention will be described with reference to FIG. As shown in FIGS. 5 (a) and 5 (b), the package 1 includes a pair of multilayer films 7 and 7, and the peripheral edges of the pair of multilayer films 7 and 7 are bonded to each other by heat sealing to form a heat sealing portion 2. Is forming. Here, FIG. 5 (a) is a plan view of the package 1, and FIG. 5 (b) is a side sectional view of the package 1.

[0010] In this case, each multilayer film 7 includes at least a laser absorbing layer 5 and a laser non-absorbing layer 6, of which the laser absorbing layer 5 is a layer that absorbs laser light and is not a laser. The absorption layer 6 is a layer that does not absorb the laser beam. Further, the pair of multilayer films 7 are laminated with the laser non-absorbing layers 6 facing inward, and the heat-sealed portion 2 is formed by laminating the laser non-absorbing layers 6 together by heat sealing. Further, the heat seal portion 2 includes a vertical heat seal portion 2a and a horizontal heat seal portion 2b.

[0011] Further, the package 1 is provided with a pair of notches 3 at a portion located at the edge of the package 1, and a laser processing line 4 is formed between the notches 3. The laser processing line 4 is obtained by heating and melting a part of the laser absorption layer 5 by irradiating the laser absorption layer 5 on the surface side of each multilayer film 7 with laser light.

[0012] As described above, the laser processing lines 4 are provided on the front surface and the back surface of the package 1, and both ends of each laser processing line reach the edge of the package 1.

[0013] Further, the laser processing line 4 passes through the heat-sealed portion 2 and the non-heat-sealed region 9 of the packaging body 1, and therefore, when the packaging body 1 is opened along the laser processing line 4, heat is generated. An opening is formed in the unsealed region 9.

By the way, as described above, each multilayer film 7 is composed of a laser absorbing layer 5 and a laser non-absorbing layer 6. As the laser absorbing layer 5, for example, the laser absorbing layer has good good laser absorption and constitutes a packaging bag. Since it is a basic material, a resin film or sheet having excellent mechanical, physical, chemical, and other properties can be used. Specifically, for example, polyester resin and polyamide resin can be used. A film or sheet of a tough resin such as a resin, a polyaramid resin, a polypropylene resin, a polycarbonate resin, a polyacetal resin, a fluorine resin, or the like can be used.

[0015] Thus, as the resin film or sheet, any unstretched film, stretched film stretched in the uniaxial direction or the biaxial direction, or the like can be used.

[0016] Further, in the present invention, the thickness of the resin film may be a thickness that can be maintained at the minimum necessary for strength, rigidity, etc. If it is too thick, laser processing defects described later will occur. As a result, the tearability is lowered and the cost is increased. On the contrary, if it is too thin, the strength, rigidity and the like are lowered, which is not preferable.

[0017] In the present invention, for the above reasons, about 10 μm to 50 μm, preferably about 12 μm to 25 μm is the most desirable.

By the way, in the present invention, among the above-mentioned resin films, the resin film as the laser absorbing layer 5 has rigidity, mechanical toughness, bending resistance, and puncture resistance. Biaxially stretched polyamide film that has excellent melt resistance such as impact resistance, cold resistance, heat resistance, and chemical resistance, and also has printability.<u style="single">、</u>It is most preferable to use a polyester film.

[0019] Further, the above-mentioned biaxially stretched polyamide film or the like has an orientation close to the flow direction of the film, has a very small tearing deviation even when superposed, and is absorbed by the oscillation wavelength of a carbon dioxide laser as described later. Therefore, it has an advantage that it can be easily performed for laser processing when providing a cut for opening.

[0020] Examples of the biaxially stretched polyamide film include nylon films such as nylon-6, nylon-66, nylon-11, nylon-12, nylon-6, and 10, and NON-coated biaxially stretched films. Polyvinylidene chloride coated biaxially stretched film or the like can be used.

[0021] Further, as the laser non-absorbing layer 6, for example, a film or sheet having good heat sealing property and low laser absorbing property can be used. Specifically, any material may be used as long as it can be melted by heat and fused to each other. For example, low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, polypropylene, ethylene- Vinyl acetate copolymer, ionomer resin, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-propylene copolymer, methylpentene polymer, polyethylene, polypropylene, etc. An acid-modified polyolefin-based resin obtained by modifying a polyolefin-based resin with an unsaturated carboxylic acid such as acrylic acid, methacrylic acid, maleic anhydride, fumaric acid, or the like, or a single layer or a multilayer of a resin composed of one or more of the other resins. Films or sheets can be used.

[0022] The thickness of the film is preferably 10 μm or more, preferably 40 μm or more, and more preferably about 80 μm to 300 μm.

[0023] In particular, the heat-sealable resin film is about 2 to 20 times thicker, preferably about 4 to 10 times thicker than the resin film having the strength as the laser absorption layer 5. It is desirable to have a thickness of.

[0024] In the present invention, by using a film having the above-mentioned thickness, the rigidity and strength of the film are increased, and the physical properties of the resin film having excellent strength as the laser absorbing layer 5 are combined. When configured for packaging, it has the advantages of good paper maintainability as a bag, easy refilling work for consumers, and convenient handling at stores during the distribution process. It also retains the storability of the contents.

By the way, in the present invention, among the resin films as described above, the resin film having heat-sealing property used as the laser non-absorbent layer 6 is linear low-density polyethylene or ethylene-vinyl acetate. It is most preferable to use a film or sheet mainly composed of a copolymer.

[0026] That is, the above-mentioned film mainly composed of linear low-density polyethylene or ethylene-vinyl acetate copolymer has an advantage that the propagation of fracture is small and the impact resistance is improved because it has adhesiveness. In addition, since the laser non-absorbent layer 6 is always in contact with the contents, it is also effective for preventing deterioration of the environmental stress cracking resistance.

[0027] In the present invention, another resin can be blended with the linear low-density polyethylene or ethylene-vinyl acetate copolymer, for example, by blending a root ethylene-butene copolymer or the like. Although it is slightly inferior in heat resistance and tends to deteriorate the sealing stability in a high temperature environment, it has an advantage that the tearability is improved and it contributes to easy opening.

[0028] Further, in the present invention, the linear low-density polyethylene as the film of the resin having the heat-sealing property as described above is specifically an ethylene-α / olefin copolymer polymerized using a metallocene catalyst. Films or sheets can be used in the same manner.

[0029] Examples of the film or sheet of the ethylene-α / olefin copolymer polymerized using the above-mentioned metallocene catalyst include a catalyst using a combination of a metallocene complex and almoxane, such as a catalyst using a combination of zirconocene dichloride and methylarmoxane. That is, a film or sheet of an ethylene-α / olefin copolymer polymerized using a metallocene catalyst can be used.

[0030] The metallocene catalyst is also called a single-site catalyst because the current catalyst is non-uniform at the active site and is called a multisite catalyst, whereas the active site is uniform.

[0031] Specifically, the product name "Kernel" manufactured by Mitsubishi Chemical Co., Ltd., the product name "Evolu" manufactured by Mitsui Petrochemical Industry Co., Ltd., and the product name "Exact" manufactured by EXXON CHEMICAL, USA. (EXACT) , an ethylene-α / olefin copolymer polymerized using a metallocene catalyst such as AFFINITY , a trade name manufactured by Dow Chemical Co., Ltd. in the United States, and ENGAGE , a trade name. Film can be used.

[0032] Therefore, in the present invention, the above-mentioned ethylene-α / olefin copolymer film can be used in the state of a coating film or the like made of a composition containing the resin.

[0033] The thickness of the film or film is about 5 μm to 300 μm, preferably about 10 μm to 100 μm, and it also functions as a single-layer or multi-layer sealing layer.

[0034] In the present invention, when a film or sheet of an ethylene-α / olefin copolymer polymerized using a metallocene catalyst is used as the resin film having the heat-sealing property as described above, the bag resistance is maintained. It has the advantage of being capable of low temperature heat sealing during production.

An intermediate layer may be provided between the laser absorbing layer 5 and the laser non-absorbing layer 6. For example, a base material layer having a barrier property to be used as an intermediate layer will be described. As the base material layer having the above, for example, a material having a property of blocking light such as sunlight or a property of not transmitting gas such as water vapor, water, oxygen, etc. can be used. It may be a base material, or may be a composite base material obtained by combining two or more kinds of base materials.

[0036] Specifically, for example, a resin film having an aluminum foil having a light-shielding property and a barrier property or a resin film having a vapor-deposited film thereof, a resin having a vapor-deposited film of an inorganic oxide such as silicon oxide having a barrier property and aluminum oxide. Films or sheets of resins such as low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, polypropylene, ethylene-propylene copolymer, etc. that have barrier properties such as film, water vapor, and water, gas barrier properties A film or sheet of a resin such as polyvinylidene chloride, polyvinyl alcohol, ethylene-vinyl acetate copolymer saponified product, a colorant such as the content of the resin, and other desired additives are added and kneaded to form a film. Various colored resin films or sheets having a light-shielding property can be used.

[0037] These materials may be used in combination of one or more.

[0038] The thickness of the film or sheet is arbitrary, but is usually preferably about 5 μm to 300 μm, more preferably about 10 μm to 100 μm.

[0039] Further, in the above, the aluminum foil having a thickness of about 5 μm to 30 μm and the vapor-deposited film of aluminum or an inorganic oxide having a thickness of about 100 angstrom to 2000 angstrom should be used. Can be done.

[0040] Examples of the resin film supporting the vaporized film include polyester film, polyamide film, polyolefin film, polyvinyl chloride film, polycarbonate film, polyvinylidene chloride film, polyvinyl alcohol film, and ethylene-vinyl acetate. A copolymer saponified film, etc. can be used.

[0041] Further, in the above, examples of the inorganic oxide constituting the vapor-deposited film layer of the inorganic oxide include silicon oxide (SiO).₂), Aluminum oxide, idium oxide, tin oxide, zirconium oxide and the like can be used.

[0042] Further, in the present invention, the inorganic oxide may be a mixture of silicon monoxide and silicon dioxide, or a mixture of silicon oxide and aluminum oxide.

[0043] Therefore, in the present invention, as a method for forming a thin film layer of an inorganic oxide, a thin-film deposition film is formed by a vacuum vapor deposition method such as an ion beam method or an electron beam method, a sputtering method, or the like. be able to.

[0044] In the above, the thickness of the thin film layer of the inorganic oxide is usually preferably about 100 angstroms to 2000 angstroms in order to obtain sufficient barrier properties, and in particular, in the present invention, 200 angstroms. Or 1500 angstroms is desirable.

[0045] In the above, when the thickness of the thin film layer of the inorganic oxide exceeds 1500 angstroms, particularly when it exceeds 2000 angstroms, cracks or the like are likely to occur in the thin film layer of the inorganic oxide, thereby lowering the barrier property. It is not preferable because there is a problem that the material cost is high, and it is difficult to recognize the effect when the angstrom is less than 100 angstroms, particularly less than 200 angstroms, which is not preferable.

[0046] By the way, since packaging containers are usually placed under harsh physical and chemical conditions, strict packaging suitability is required for the laminates constituting the packaging containers, and deformation prevention strength is required. , Drop impact strength, pinhole resistance, heat resistant surname, sealing property, quality maintenance, workability, hygiene, and other conditions are required. Therefore, in the present invention, as described above. In addition to the material, other materials satisfying the above-mentioned conditions can be arbitrarily used. Specifically, for example, low-density polymer, medium-density polyethylene, high-density polyethylene, linear low-density polymer can be used. , Polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid or methacrylate copolymer, methylpentene polymer, polybutene resin, poly Vinyl chloride resin, polyvinyl acetate resin, polyvinylidene chloride resin, vinyl chloride-vinylidene chloride copolymer, poly (meth) acrylic resin, polyacrylic nitrile resin, polystyrene resin, acrylonitrile-styrene copolymer (AS-based resin), acrylonitrile-phthalgen-styrene copolymer (ABS-based resin), polyester-based resin, polyamide-based resin, polycarbonate-based resin, polyvinyl alcohol-based resin, saponified product of ethylene-vinyl acetate copolymer, fluorine-based It can be arbitrarily selected from films or sheets of known resins such as resins, diene resins, polymer resins, polyurethane resins, nitrocellulose, and the like.

[0047] In addition, for example, a film such as cellophane, synthetic paper, or the like can also be used.

[0048] In the present invention, the above-mentioned film or sheet can be any of unstretched, uniaxially and biaxially stretched films and the like.

[0049] Further, although the thickness thereof is arbitrary, it can be selected and used from a range of about several μm to about 300 μm.

[0050] Further, in the present invention, the film or sheet may be a film having any properties such as an extruded film, an inflation film, and a coating film.

Next, in the above-mentioned present invention, at least a resin film having a heat-sealing property as the laser non-absorbing layer 6 and a resin film having excellent strength as the laser absorbing layer 5 are laminated and at least. As a method for producing a two-layer lamination resistance, or as the above-mentioned resin film having heat-sealing property as a laser non-absorbing device 6, a base material layer having a barrier property as an intermediate layer, and a laser absorbing layer 5. A method of laminating a resin film having excellent strength of the above to produce a laminating resistance consisting of at least three layers will be described. Such a method includes a laminating method used when producing a normal packaging material, for example. Wet lamination method, dry lamination method Root-free dry lamination method, extrusion lamination method, co-extrusion lamination method, and other methods can be used.

[0052] Therefore, in the present invention, when the above-mentioned lamination is performed, if necessary, a pretreatment such as a corona treatment or an ozone treatment can be applied to the film, and for example, an isocyanate-based film can be applied. Urethane-based), polyethyleneimine-based, polybutagen-based, organic titanium-based anchor coating agents, polyurethane-based, polyacrylic, polyester-based, epoxy-based, polyvinyl acetate-based, cellulose-based, and other laminating adhesives, etc. Known anchor coating agents, adhesives and the like can be used.

By the way, in the method for producing a laminate as described above, examples of the extruded resin constituting the adhesive resin layer at the time of extrusion laminating include polyethylene, ethylene-α / olefin copolymer, polypropylene, polybutene, and the like. Polyisobutylene, polyisobutylene, polybutadiene, polyisobutylene, ethylene-methacrylic acid copolymer, or a copolymer of ethylene and unsaturated carboxylic acid such as an ethylene-acrylic acid copolymer, or an acid-modified polyolefin resin obtained by modifying them. Ethylene-ethyl acrylate copolymers, ionomer resins, ethylene-vinyl acetate copolymers, etc. can be used.

[0054] Further, in the present invention, as the adhesive constituting the adhesive layer at the time of dry laminating, specifically, a two-component curable urethane-based adhesive and a polyester-urethane-based adhesive used in dry laminating and the like are used. Agents, polyether urethane adhesives, acrylic adhesives, polyester adhesives, polyamide adhesives, polyvinyl acetate adhesives, epoxy adhesives, rubber adhesives, etc. can be used.

Next, an apparatus for manufacturing a package will be described. As shown in FIGS. 1 to 4, the package manufacturing apparatus 10 includes a paper feed unit 11 that feeds out a web-shaped multilayer film 7,7 from a pair of unheat-sealed multilayer films 7,7. , A first dancer section 12 sequentially provided on the downstream side of the paper feed section 11, a feeding roller 13, and a second dancer section 14 are provided.

[0056] Of these, the first and second dancer portions 12, 14 temporarily store a pair of multilayer films 7, 7, and the first and second dancer portions 12, 14 are used to temporarily store the pair of multilayer films 7,7 from the paper feed section 11. At the same time that the pair of multilayer films 7 and 7 are continuously fed out, the pair of multilayer films 7 and 7 can be intermittently conveyed on the downstream side.

Further, on the downstream side of the second dancer portion 14, a pair of multilayer films 7 and 7 are heat-sealed in the vertical direction to form a vertical heat-sealing portion 2a, and a vertical heat-sealing portion 15 is heat-sealed. A vertical cooling section 16 for cooling the vertical heat sealing section 2a of the pair of multilayer films 7 and 7 is sequentially provided. Further, on the downstream side of the vertical cooling unit 16, a rubber roller 17 for feeding a pair of multilayer films 7 and 7 and a constant tension device 18 for applying a constant tension to the pair of multilayer films 7 and 7 are provided.

Further, on the downstream side of the constant tension device 18, a pair of multilayer films 7 and 7 are heat-sealed in the lateral direction to form a lateral heat-sealing portion 2b, and a lateral heat-sealing device 19 and heat-sealing. Lateral cooling portions 20 for cooling the lateral heat sealing portions 2b of the pair of multilayer films 7 and 7 are sequentially provided.

[0059] Further, on the downstream side of the lateral cooling unit 20, a notch / laser processing line forming portion 30 for forming a notch 3 and a laser processing line 4 on a pair of multilayer films 7 and 7 is provided, and the notch / laser processing is provided. On the downstream side of the line forming portion 30, a cutting portion 21 for cutting the pair of multilayer films 7 and 7 into a package shape to prepare the package 1 and a rubber roller 23 are provided.

[0060] Further, on the downstream side of the cutting portion 21, a packaging body discharging portion 22 for discharging the packaging body 1 is provided. In FIG. 11, the paper feed section 11 to the package discharge section 22 form a film transport line 25 that transports a pair of multilayer films 7 and 7.

Next, the notch / laser machined line forming portion 30 will be described in detail with reference to FIGS. 2 and 3. As shown in FIGS. 2 and 3, the notch / laser machined line forming portion 30 is a notch forming device 33 for forming the notch 3 in the portion of the pair of multilayer films 7 and 7 located at the edge of the package 1. And the width of the package 1 from the upper laser irradiation device (carbon dioxide laser) 31 for forming the laser processing line 4 on the upper multilayer film 7 and the upper laser irradiation device 31 (transfer pitch of the pair of multilayer films 7, 7). ) Is arranged on the downstream side, and has a lower laser irradiation device (carbon dioxide laser) 32 for forming a laser processing line 4 on the lower multilayer film 7. Of these, the notch forming device 33 penetrates the pair of multilayer films 7 and 7 to form the notch 3, and a receiving portion 34 is provided below the notch forming device 33. Further, the notch forming device 33 and the receiving portion 34, the upper laser irradiation device 31, and the lower laser irradiation device 32 are all supported on the same gantry 35. In this case, the notch forming device 33 and the receiving portion 34 are supported on the gantry 35 via the support 36.

[0062] The notch forming device 33 may be provided on the downstream side of the upper laser irradiation device 31 and the lower laser irradiation device 32.

[0063] Next, the operation of the present embodiment having such a configuration will be described.

[0064] First, as shown in FIG. 1, in the paper feed unit 11, the multilayer films 7, 7 are continuously fed out from the pair of multilayer films 7, 7 in the wound state. The transport speed of the pair of multilayer films 7 and 7 can be set arbitrarily. In the present embodiment, each multilayer film 7 is a laminate formed by dry-laminating a laser absorbing layer 5 (nylon layer) and a laser non-absorbing layer 6 (linear low-density polyethylene layer). ..

Next, the pair of multilayer films 7 and 7 feed the first dancer portion 12 and the feeding roller 13 to reach the longitudinal heat sealing device 15 from the second dancer portion 13.

[0066] In the vertical heat sealing device 15, the pair of multilayer films 7 and 7 are heat-sealed in the vertical direction, and the pair of multilayer films 7 and 7 are formed with the vertical heat sealing portion 2a. During this period, the pair of multilayer films 7 and 7 are intermittently conveyed on the downstream side of the vertical heat sealing device 15, and the multilayer films 7 and 7 between the paper feed unit 11 and the vertical heat sealing device 15 are the first and second layers. It is absorbed by the dancers 12, 14. Next, the vertical heat-sealing portion 2a of the pair of multilayer films 7 and 7 is cooled by the vertical cooling portion 16, and then the pair of multilayer films 7 and 7 pass through the rubber roller 17 and the constant tension device 18 to the horizontal heat-sealing device. Reach 19

[0067] In the lateral heat sealing device 19, the pair of multilayer films 7 and 7 are heat-sealed in the lateral direction, and the pair of multilayer films 7 and 7 are formed with the lateral heat sealing portion 2b. Next, the lateral heat-sealing portions 2b of the pair of multilayer films 7 and 7 are cooled by the lateral cooling portion 20.

[0068] In this way, the vertical heat sealing device 15 and the horizontal heat sealing device 19 form the vertical heat sealing portion 2a and the horizontal heat sealing portion 2b on the pair of multilayer films 7 and 7, and these vertical heat sealing portions 2b. The heat-sealed portion 2a and the lateral heat-sealed portion 2b form a package 2 arranged in two rows on a pair of multilayer films 7 and 7.

[0069] Next, in the notch / laser machined line forming portion 30, the notch 3 and the laser machined line 4 are formed on the pair of multilayer films 7 and 7. That is, first, when the pair of multilayer films 7 and 7 enter the notch / laser machined line forming portion 30, the notch forming device 33 penetrates the pair of multilayer films 7 and 7 and reaches the receiving portion 34 to form the notch 3. Form. In this case, the notch forming apparatus 33 forms two notches 3, 3 in substantially the central portion of the pair of multilayer films 7, 7. Of these, one notch 3 is a notch for the package 1 in one row, and the other notch 3 is a notch for the package 1 in the other row, both of which are located at the edge of the package 1. Is formed in.

[0070] The shape of the notch 3 may be U-shaped, I-shaped, or V-shaped.

Next, of the pair of multilayer films 7 and 7, the upper multilayer film 7 is irradiated with laser light from the upper laser irradiating device 31. In this case, the nylon layer of the multilayer film 7 absorbs the laser light from the upper laser irradiation device 31 and heats and melts to form two laser processing lines 4. One of the laser-processed lines 4 is the laser-processed line 2 for the package 1 in one row, and the other laser-processed line 4 is the laser-processed line for the package 1 in the other row.

After that, the lower multilayer film 7 is similarly irradiated with laser light from the lower laser irradiation device 32, and the lower multilayer film 7 is laser-processed by the laser light from the lower laser irradiation device 32. Lines 4 and 4 are formed. The laser processing lines 4 and 4 formed by the lower laser irradiation device 32 are shifted to the downstream side by one pitch with respect to the laser processing lines 4 and 4 formed by the upper laser irradiation device 31.

Next, FIG. 4 shows the action timing in the notch / laser machined line forming portion 30. Of these, Fig. 4 (a) shows the transport speed of the pair of multilayer films 7 and 7. As shown in FIG. 4 (a), the pair of multilayer films 7 and 7 are intermittently conveyed with the width of the package 1 as one pitch, and during this time, the notch forming apparatus 33 is based on the notch signal shown in FIG. 4 (b). Activates to form notch 3.

Further, as shown in FIG. 4 (c), the operation timing of the upper laser irradiation device 31 and the lower laser irradiation device 32 is set after the notch signal is output.₁Later turned on, t₂It will be turned off later. During this time t₁From t₂Until then, the laser beam is continuously irradiated from the upper laser irradiation device 31 and the lower laser irradiation device 32. In addition, the transport speed of the pair of multilayer films 7 and 7 gradually increases from 0, reaches the maximum value in the middle, and then gradually decreases (Fig. 4 (a)). Therefore, the irradiation amount of the laser beam is large in the vicinity of the notch 3 of the package 1, and the irradiation amount of the laser light is small in the central portion of the package 1. Therefore, the width of the laser processing line 4 can be increased in the vicinity of the notch 3 and decreased in the central portion of the package 1.

By increasing the width of the laser-machined line 4 in the vicinity of the notch 3 in this way, when the package 1 is cut from the notch 3, the laser-machined line 4 can be smoothly cut from the notch 3.

[0076] Note that the operation timings of the upper laser irradiation device 31 and the lower laser irradiation device 32 are set with reference to the notch signal.₁From t₂The example defined up to is shown, but t₁If is too short, t relative to the notch signal₁And t₂Later, the upper laser irradiation device 31 and the lower laser irradiation device 32 may be turned ON and OFF at the next pitch.

[0077] As described above, according to the present embodiment, the pair of multilayer films 7, 7 are bonded to the pair of multilayer films 7, 7 by the vertical heat sealing device 15 and the horizontal heat sealing device 19. On the other hand, since the notch 3 is formed and the laser machined line 4 is formed in the notch / laser machined line forming portion 30, the notch 3 and the laser machined line 4 can be accurately aligned. Further, the laser processing line 4 of the upper multilayer film 7 and the laser processing line 4 of the lower multilayer film 7 can be aligned with high accuracy.

[0078] Therefore, when the package 1 is torn from the notch 3, it can be smoothly torn from the notch 3 through the laser processing lines 4 and 4 of the multilayer films 7 and 7 above and below.

[Effect of the Invention] As described above, according to the present invention, a laser-absorbed layer of a pair of films is heated and melted in a package manufacturing apparatus to form a laser processing line to produce a package. Therefore, the positions of the laser processing lines on the front surface and the back surface of the package do not shift, and the package can be easily torn along the laser processing lines.<u style="single">Further, the width of the laser processing line provided on the package obtained from the pair of films increases in the vicinity of the edge of the package of the pair of films and decreases in the central portion of the package of the pair of films. When tearing the package from the edge, it can be cut smoothly.</u>Therefore, the tearing action can be easily performed, and the opened opening shape can be stabilized.

BRIEF DESCRIPTION OF THE DRAWINGS [FIG. 1] FIG. 1 is a diagram showing an apparatus for manufacturing a package according to the present invention.

FIG. 2 is a side view showing an upper and lower laser irradiation device.

FIG. 3 is a plan view showing an upper and lower laser irradiation device.

FIG. 4 is a diagram showing operation timings of upper and lower laser irradiation devices.

FIG. 5 is a diagram showing a package according to the present invention.

[Code description] 1 Package 2 Heat seal 3 Notch 4 Laser processing line 5 Laser absorption layer 6 Laser non-absorb layer 7 Multilayer film 10 Package manufacturing equipment 11 Paper feed unit 15 Vertical heat seal device 19 Horizontal heat seal device 21 Cutting part 31 Upper laser irradiation device 32 Lower laser irradiation device 33 Notch forming part